Home Symbol which looks like a small house Up Solid circle with an upward pointer in it

DBe


Constants of diatomic molecules

Go To: Top, References, Notes

Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Data compiled by: Klaus P. Huber and Gerhard H. Herzberg

Data collected through September, 1976

Symbols used in the table of constants
SymbolMeaning
State electronic state and / or symmetry symbol
Te minimum electronic energy (cm-1)
ωe vibrational constant – first term (cm-1)
ωexe vibrational constant – second term (cm-1)
ωeye vibrational constant – third term (cm-1)
Be rotational constant in equilibrium position (cm-1)
αe rotational constant – first term (cm-1)
γe rotation-vibration interaction constant (cm-1)
De centrifugal distortion constant (cm-1)
βe rotational constant – first term, centrifugal force (cm-1)
re internuclear distance (Å)
Trans. observed transition(s) corresponding to electronic state
ν00 position of 0-0 band (units noted in table)
Diatomic constants for 9BeD
StateTeomegaeomegaexeomegaeyeBealphaegammaeDebetaereTrans.nu00
G 2Pi 58750 302.5 Z 23.6  [2.747] 1 2   [10E-4] 3  [1.931] G larrow X R 58134.9 Z
Colin and De Greef, 1975
F 2Sigma+ (56606) (1598) 4   [5.879]   [3.01E-4] 3  [1.3198] F larrow X 56644.87 Z
Colin and De Greef, 1975
E' (2Sigma+) [54230] 5    [5.260] 5     [1.395] 5 E' larrow X 50533.8 5 Z
Colin and De Greef, 1975
E 2Sigma+ (54135) (1460) 4   [5.745] 6   [3.8E-4]  [1.335] E larrow X 54104.9 Z
Colin and De Greef, 1975
StateTeomegaeomegaexeomegaeyeBealphaegammaeDebetaereTrans.nu00
D 2Sigma+, 2Pi, 2Delta (54000) 7          D larrow X 54050
Colin and De Greef, 1975
B 2Delta 50906 1646.22 Z 25.15 8  5.9963 9 10 0.1217 11 -0.0089 [3.11E-4] 12  1.3068 B larrow X V 50963.02 Z
Colin and De Greef, 1975
A 2Pir 20036.11 13 1551.13 Z 23.00  5.7614 14 0.1344 -0.0003 3.181E-4 15 -0.0000022 1.3332 A lrarrow X V 20045.91 16 Z
missing citation; Horne and Colin, 1972
X 2Sigma+ 0 1530.32 Z 20.71  5.6872 0.1225 -0.001 3.138E-4  1.3419  

Notes

1Average from P,R and Q branches. Transitions to v'=1 and 2 consist of Q branches only, strongly perturbed for v'=2. The Q branch constants are given by B'v = 2.197 + 1.205(v+1/2) - 0.167(v+1/2)2.
2See BeH note d.
3Additional Dv and higher order constants in Colin and De Greef, 1975.
4Using isotope relations.
5Unidentified single level, vibrational numbering unknown. In absorption from v"=2.
6See BeH note i.
7Strong absorption, complex structure.
8Inclusion of v=3 changes these constants to omegae = 1607.29, omegaexe = -5.32, omegaeye = -6.77. .
9Lambda-type doubling, Deltavef(v=0) = +0.074*N(N+l).
10See BeH notes d and l.
11(vleq2); recalculated from Colin and De Greef, 1975.
12For additional Dv and higher order constants see Horne and Colin, 1972.
13See BeH note n. A ~ +1.9.
14Lambda-type doubling, Deltavef(v=0) = +0.004l9*N(N+l) -...; additional constants in Horne and Colin, 1972.
15Higher order constants in Horne and Colin, 1972.
16Pure vibronic energy difference, not to be confused with the band origin as usually defined in these tables. See Horne and Colin, 1972.
17From the value for BeH.

References

Go To: Top, Constants of diatomic molecules, Notes

Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Colin and De Greef, 1975
Colin, R.; De Greef, D., The absorption spectrum of the BeH and BeD molecules in the vacuum ultraviolet, Can. J. Phys., 1975, 53, 2142. [all data]

Horne and Colin, 1972
Horne, R.; Colin, R., The A2«PI»-X2«SIGMA»+ band system of BeH and BeD in absorption, Bull. Soc. Chim. Belg., 1972, 81, 93. [all data]


Notes

Go To: Top, Constants of diatomic molecules, References